1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_ 6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_ 7 8 #include "base/memory/scoped_vector.h" 9 #include "base/process/process.h" 10 #include "base/sync_socket.h" 11 #include "base/time/time.h" 12 #include "media/audio/audio_input_controller.h" 13 #include "media/audio/audio_parameters.h" 14 #include "media/base/audio_bus.h" 15 16 #if defined(OS_POSIX) 17 #include "base/file_descriptor_posix.h" 18 #endif 19 20 namespace base { 21 class SharedMemory; 22 } 23 24 namespace content { 25 // A AudioInputController::SyncWriter implementation using SyncSocket. This 26 // is used by AudioInputController to provide a low latency data source for 27 // transmitting audio packets between the browser process and the renderer 28 // process. 29 class AudioInputSyncWriter : public media::AudioInputController::SyncWriter { 30 public: 31 explicit AudioInputSyncWriter(base::SharedMemory* shared_memory, 32 int shared_memory_segment_count, 33 const media::AudioParameters& params); 34 35 virtual ~AudioInputSyncWriter(); 36 37 // media::AudioInputController::SyncWriter implementation. 38 virtual void UpdateRecordedBytes(uint32 bytes) OVERRIDE; 39 virtual void Write(const media::AudioBus* data, 40 double volume, 41 bool key_pressed) OVERRIDE; 42 virtual void Close() OVERRIDE; 43 44 bool Init(); 45 bool PrepareForeignSocket(base::ProcessHandle process_handle, 46 base::SyncSocket::TransitDescriptor* descriptor); 47 48 private: 49 base::SharedMemory* shared_memory_; 50 uint32 shared_memory_segment_size_; 51 uint32 shared_memory_segment_count_; 52 uint32 current_segment_id_; 53 54 // Socket for transmitting audio data. 55 scoped_ptr<base::CancelableSyncSocket> socket_; 56 57 // Socket to be used by the renderer. The reference is released after 58 // PrepareForeignSocketHandle() is called and ran successfully. 59 scoped_ptr<base::CancelableSyncSocket> foreign_socket_; 60 61 // The time of the creation of this object. 62 base::Time creation_time_; 63 64 // The time of the last Write call. 65 base::Time last_write_time_; 66 67 // Size in bytes of each audio bus. 68 const int audio_bus_memory_size_; 69 70 // Vector of audio buses allocated during construction and deleted in the 71 // destructor. 72 ScopedVector<media::AudioBus> audio_buses_; 73 74 DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputSyncWriter); 75 }; 76 77 } // namespace content 78 79 #endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_ 80